(This is the documentation for SDL3, which is under heavy development and the API is changing! SDL2 is the current stable version!)

SDL_isalnum

Query if a character is alphabetic (a letter) or a number.

Header File

Defined in <SDL3/SDL_stdinc.h>

Syntax

int SDL_isalnum(int x);

Function Parameters

Return Value

Returns non-zero if x falls within the character class, zero otherwise.

Remarks

WARNING: Regardless of system locale, this will only treat ASCII values for English 'a-z', 'A-Z', and '0-9' as true.

Thread Safety

It is safe to call this function from any thread.

Version

This function is available since SDL 3.0.0.

CategoryAPI, CategoryAPIFunction, CategoryStdinc